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Long-Term Debt (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Mar. 10, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Aug. 14, 2013
USD ($)
Debt Instrument [Line Items]            
Senior notes           $ 500,000,000
Cash dividend to former parent       $ 650,000,000    
Fixed charge coverage ratio 0.70   0.70      
Fixed charge coverage ratio threshold, percentage of aggregate facility commitments and borrowing base 17.50%   17.50%      
Fixed charge coverage ratio threshold, amount of aggregate facility commitments and borrowing base     $ 70,000,000      
Dividend restrictions     After giving effect to the applicable restrictions on certain payments, which could include dividends under the credit agreement (which restrictions are only applicable when availability under the credit agreement does not exceed the greater of 25% of the lesser of the revolving commitments and the borrowing base and $100 million (and if availability under the credit agreement does not exceed the greater of 40% of the lesser of the revolving commitments and the borrowing base and $100 million, then our fixed charge coverage ratio must be at least 1.0 to 1.0) and the indenture, and subject to compliance with applicable law.  As of December 31, 2015, the Company had a shortfall of approximately $245.7 million of its net income and retained earnings subject to such restrictions before the fixed charge ratio would exceed 1.0 to 1.0 .      
Net income and retained earnings free of restrictions, excess (deficit) of         $ (245,700,000)  
Minimum            
Debt Instrument [Line Items]            
Fixed charge coverage ratio 1.0   1.0   1.0  
Period for fixed charge coverage ratio threshold (in days)     3 days      
Dividend restriction threshold as a percentage of revolving commitments and borrowing base 25.00%   25.00%      
Dividend restriction threshold as amount of availability $ 100,000,000   $ 100,000,000      
Dividend restrictions, fixed charge coverage ratio     1.0      
Maximum            
Debt Instrument [Line Items]            
Secured leverage ratio 4.5   4.5      
Dividend restriction threshold as a percentage of revolving commitments and borrowing base with consideration of fixed charge coverage ratio 40.00%   40.00%      
Dividend restriction threshold as amount of availability with consideration of fixed charge coverage ratio $ 100,000,000   $ 100,000,000      
Federal Funds Rate            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     0.50%      
LIBOR            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.00%      
Interest period one (in months)     1 month      
Interest period two (in months)     2 months      
Interest period three (in months)     3 months      
Interest period four (in months)     6 months      
Cash            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 100.00%   100.00%      
Credit Card Receivables            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 90.00%   90.00%      
Investment Grade Accounts            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 90.00%   90.00%      
Other Accounts            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 85.00%   85.00%      
Midstream Refined Products Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 80.00%   80.00%      
Refined Retail Products Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 75.00%   75.00%      
Retail Merchandise Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against 70.00%   70.00%      
Percentage of net orderly liquidation value available to borrow against 85.00%   85.00%      
Asset-Based Loan Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 450,000,000   $ 450,000,000      
Outstanding debt 0   $ 0      
Asset-Based Loan Facility | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.50%      
Asset-Based Loan Facility | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.00%      
Asset-Based Loan Facility | Alternative Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     0.50%      
Asset-Based Loan Facility | Alternative Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.00%      
Term Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 200,000,000   $ 200,000,000      
Proceeds borrowed from credit facility   $ 200,000,000        
Term (in years)     4 years      
Quarterly amortization payment (percent)     5.00%      
Quarterly amortization payment 10,000,000          
Term Facility | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.50%      
Term Facility | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.75%      
Term Facility | Alternative Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.50%      
Term Facility | Alternative Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.75%      
Incremental Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 150,000,000   $ 150,000,000      
Letter Of Credit            
Debt Instrument [Line Items]            
Line of credit facility, sublimit $ 200,000,000   $ 200,000,000      
Senior Notes            
Debt Instrument [Line Items]            
Interest rate (percent) 6.00%   6.00%     6.00%